Noiseless typewriter



April 30,1935. I H. SCHULEJR 1,999,343

NIOISELESS TYPEWRITER Filed 001;. 3. 1933 I 1/1: 91 for;

Patented Apr. 30, 1935 1,399,343 NOISELESS TYPEWBITER- Hugo Schiller, Ghemnitz, Germany, assignor to Wanderer-Werke vorm. Winklhofer & J aenicke Akt.-Ges., Schonau-Chemnitz, Germany Application October 3, 1933, Serial No. 692,006 In Germany October 12, 1932 printing point.

In typewriters of this type there is provided be- 5 tween the key actuated drive rods and the intermediate rods, driving the type carrier bars, no constant fixed connection. I When the drive rod is arrested by a stop, the intermediate rod is re-' leased and continues to move until the types reach printing position. In these machines means are provided for exactly adjusting the elevation and the force of the type impact for each separate type carrier bar.

The primary object of the invention is to provide, in addition to the adjustability of the type drive mechanism whereby the position of the parts and the force of the impact in printing can be varied, a further adjustment by means of which the normal or rest position alone of the members can be influenced. The advantages of this further adjustability consists in thatthe conditions of actuation at the beginning of the movement can be precisely adjusted, and that the intermediate members, shifted with respect to each other by the other adjustments, can be so set in the normal position that no parts will strike against each other or come intomutual resilient contact. Furthermore, the type carriers according to the invention can be so adjusted in their normal position that the types can be aligned with respect to each other .to give a good appearance. Finally, the elements are so supported in the position of rest that vibration after return of the parts from. printin g tonormal position is prevented in a simple manner.

To these ends the invention consists in that the normal or rest position of each type carrier and of the associated intermediate mechanism can be adjusted by means of stop members all arranged on a common 'stop bar and separately adjustable for each type bar, said stop members being adapted to determine the end position of a member which simultaneously limits the return movement of all the members of the intermediate mechanism.

The drawing illustrates one constructional form of the invention, all the parts of the typewriter not necessary for the invention being omitted. This form is illustrated merely as an example and 10 Claims.

the invention is not limited thereto.

In this drawing:

diagrammatically in normal position,

Fig. 2 is a side view of a part of the stop bar,

Fig. 3 is a section on the line 3-3 of Fig. 2,

Fig. 4 is a plan view of the stop bar, and

Fig. 5 is a plan view of the stop bar in modified form. 0

To a part I a of the typewriter frame i, there are pivoted links 2| and 22. Each pair of links supports a type bar I to which they are jointedly connected. The type bar is actuated by a toggle lever II. and I2. To the member l2 of the toggle there is jointed an intermediate member 20 carrying a small or fly weight 8, which transmits the movement of a lever l3 to the toggle II and I2 and thence to the type bar 1. The lever IS in turn is actuated by a curved drive member l5, shifted by means of a key, not shown, by a key lever l8 and a connecting rod 23, thereby causing the drive pin H on the lever l3 to be engaged by a hook portion iii of the drive member [5 and moved along the curved edge of said member. The drive member l5 and the key lever it are arrested in the course of this movement in known manner, for example by suitable stops when the types have approached near the printing point on the platen I4. Under the influence of the momentum of the moving masses and the fly weight 8, the intermediate mechanism i3, 20, I2 and II and the type bar 1 continue to move to the printing position, which movement must take place independently of the drive members I8, 23 and 15 against the action of a spring 24 engaging the lever l3v at one end and a bearing member H) at the other end.

For each type bar I of the machine there is provided a bearing member IQ for regulating the movement of the cushioning mechanism and the force of the blow of the type against the platen l4. To each bearing member l9 there is jointed at 25 the member i2 of the toggle H and i2, at 26 the lever l3, and at 21 the drive member i5. Each bearing member l9 can be shifted to the right or to the left, Figure 1, by means of an adjusting screw 28 having its head engaging a slot I in the bearing member and arranged on a part is of the machine frame I. Each bearing member I 9 is guided by means of projections [9a and I9!) in corresponding slots 29a and 29b in, parts la and lb fixed to or part of the machine frame i.

Preferably on the fixed part lc of the machine frame i, there is attached by means of angular lugs 2 an arcuate stop bar 3. This stop bar 3 has a number of stop members 5, one for each type bar 1. By means of the stop members 5 which can'be separately adjusted for each type bar, as will be described, the end position of the weight 8 of the intermediate mechanism I 3, 20, I2 and I I can be so determined that this part 8 in the return movement of the type carrier and the intermediate mechanism from printing to ,normal position will contact with the stop member 5 so that simultaneously the return movement of all the members of the mechanism I3, 20, I2 and II is limited. Thus, the normal position of each separate type bar I and its driving mechanism I3, 20, I2 and II is adjustable independently of the adjusting devices 28 and I9.

For this purpose the stop bar 3 is conveniently provided throughout its whole length with narrow transverse slits 4, the number and separation of these slits corresponding to the number of the type bars 'I and the separation of.the parts 8 which limit the return movement of all the members of the several mechanisms I3, 20, I2 and II. The slits 4 are enlarged to circular openings 6 at their lower ends, thus forming between each pair of slits 4 a tongue 5 which,

III, a strip 9 of impact and sound damping ma-' terial, for example of felt or the like. In the return movement of the type bars from printing to normal position, the part 8 of the mechanism I3, 20, I2 and II encounters this backing strip 9. Theresilient tongue 5 on the stop bar 3 absorbs the impact without transmitting it to the fixed member Ic which is'connected to the machine frame I. means of felt or the like together produce a completely noiseless impact on return of the type bars and associated mechanism to the normal position. I

The felt backing 9 may consist of a continuous strip which covers all the tongues 5 of the stop bar 3, Figure 4. As an alternative the backing can be cut corresponding to the slits 4 of the stop bar or each tongue 5 may be provided with a separate felt pad 9a as shown in Figure 5.

Similarly, the arrangement of the stop bar 3 'with the separate tongues 5 is such that the fly weight 8, which is arranged on each of the intermediate members 20, actuating the toggles II and I2 and which influences the movement of the intermediate mechanism I3, 20, I2 and II and of the type bar I, when said weight reaches its end position after return of the actuating mechanism from printing to normal position, will lie against the correspondingv tongue 5 or the felt pad 9a thereon. By bending the tongue 5 to the right or to the left, Figure 1, the end position of the same can be very easily and exactly adjusted to determine the position of the mechanism I3, 20, I2 and II relatively to the driving members I8, 23 and I5 in the normal position, and the fly weight 8 which is very important in determining the normal position of the type bar I can be reliably adjusted and adapted to the position occupied at any time by the bearing member I9. Non-uniformity of the type bars 1, which preferably lie in an arc of about owing to adjustment of individual bearing members I9, can be compensated by correspondingly bending the individual stop tongues 5, since varying the end position of the fly weight 8 as'in Figure 1 also causes a variation in the normal position according to Figure l of the type bar I, without the fixed pivots 25, 26 and 21 of the mechanism being shifted. Also, this arrangement prevents disturbing noise and vibration from impact of This cushioning and the damping by thefly weight 8 at the end of the return movement of the driving mechanism from the printing position.

I claim as my invention:

1. A noiseless typewriter comprising a frame, a platen, a plurality of keys, a plurality of type bars, intermediate members connected to the type bars, said type bars and intermediate members being driven by said keys from their position of rest only to a position short of the printing position, bearings for said intermediate members, a stop bar fixed on the frame, and stop members arranged on the stop bar, one for each type bar, said stop members being separately adjustable relatively to said bearings and regulating the position of rest of the type bars and the intermediate members independently of said keys.

2. A noiseless typewriter comprising a frame, a platen, a plurality of type bars, a plurality of keys, intermediate members actuated by said keys and driving said type bars, bearings for said intermediate members, means for adjusting said bearings relative to the platen to separately regulate the force of the type impact of the type bar, and stop members regulating the position of rest of respective type bars and intermediate members, each stop member being separately adjustable relatively to the platen and to said bearings.

3. A noiseless typewriter comprising a series of type bars, key operated means of limited stroke for initiating motion of said type bars, intermediate connections attached to each type bar for transmitting motion thereto from its key operated means, said connections and type bar being capable of continued motion under their momentum to the printing position after arrest of said key operated means, and stops limiting the return movement of said type bars and connections, each stop being separately adjustable to vary the position of rest of the corresponding type bar and its intermediate connections.

4. A noiseless typewriter comprising a series of type bars, key operated means of limited stroke for initiatingmotion of said type bars, a jointed rod system attached to each type bar for transmitting motion thereto from its key operated means, said system and type bar being capable of continued motion to the printing position after arrest of said key operated means, and stops each cooperating with a rod of one of said systems to limit the return movement of the corresponding type bar, each stop being separately adjustable to vary the position of rest of said type bar.

5. A noiseless typewriter according to claim 3, in which the stops are formed as projections on a fixed bar extending in proximity to and cooperating with slmilar parts of the intermediate connections of the several type bars.

6. A noiseless typewriter according to claim 3, in which the stops are formed as projections on a fixed bar extending in proximity to and cooperating with similar parts of the intermediate connections of the several type bars, said projections constituting flexible tongues separated by slits corresponding to the spaces between the type bars.

'7. A noiseless typewriter according to claim 3, in which the stops are formed as projections on a fixed bar extending in proximity to and cooperating with similar parts of the intermediate connections of the several type bars, said projections constituting flexible tongues separated by slits corresponding to the spaces between the 1,999,343 type bars and each tongue being providedwith" a pad of cushioning material.

8. A noiseless typewriter'according to claim 4, in which the stops are formed as projections on a fixed bar extending in proximity to the rods of said systems with which they cooperate.

9. A noiseless typewriter according to claim 3, in which the stops are formed as projections on a. fixed bar extending. in proximity to and cooperating with similar parts of the intermediate connections of the sev ral type bars, said projections constituting fexible tongues separated by slits corresponding to the spaces between the type bars and which tongues are provided with a continuous pad of cushioning material.

10. A noiseless typewriter comprising a series of type bars, key operated means of limited stroke for initiating motion of said type bars, intermediate connections attached to each type bar for transmitting motion thereto from its key operated means, said connections and type bar being capable of continued motion under their momentum to the printing position after arrest of said key operated means, stops limiting the return movement of said type bars and connections, each stop being separately adjustable to vary the position of rest of the corresponding type bar and its intermediate connections, and adjustment devices for separately modifying the striking action of the type bars, each such adjusting device being located immediately adjacent the stop which limits the return movement of the same type bar.

HUGO Sentinels. 

